CI only seems to make sense to me when talking about a single branch ("master", "trunk") into which all changes are frequently merged. FWIW, also Wikipedia desc

CI only seems to make sense to me when talking about a single branch ("master", "trunk") into which all changes are frequently merged. FWIW, also Wikipedia describes it as "merging all developer working copies to a shared mainline", the latter being a branch, not repo. Otherwise, you still might test indvidual feature branches on top of master, but that wouldn't prevent any conflicts between several of the pending branches. One could think of a system that continuously tests all possible combinations of all pending feature branches to spot any conflicts before actually integrating them. Not sure whether such thing exists, though, or whether it'd be very practical.